Journal of Physical Chemistry B, volume 103, issue 49, pages 10775-10780

New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses

Publication typeJournal Article
Publication date1999-12-01
Quartile SCImago
Q1
Quartile WOS
Q3
Impact factor3.3
ISSN15206106, 15205207
Materials Chemistry
Surfaces, Coatings and Films
Physical and Theoretical Chemistry
Abstract
The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectrum is observed with maxima at 560 and 480 nm. As the pump laser power increases, two new transient absorptions at 510 and 590 nm with unresolved fast rise (<100 fs) and long decay times (≫150 ps) are observed. The energy of each of the positive absorption is red shifted from that of the bleach bands by ∼120 meV. The origin of this shift is discussed in terms of the effect of the internal electric field of the many electron−hole pairs formed within the quantum dot at the high pump intensity, absorption from a metastable excited state or the formation of biexcitons.

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GOST Copy
Burda C. et al. New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses // Journal of Physical Chemistry B. 1999. Vol. 103. No. 49. pp. 10775-10780.
GOST all authors (up to 50) Copy
Burda C., Link S., Green T. C., El-Sayed M. New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses // Journal of Physical Chemistry B. 1999. Vol. 103. No. 49. pp. 10775-10780.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1021/jp991503y
UR - https://doi.org/10.1021/jp991503y
TI - New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses
T2 - Journal of Physical Chemistry B
AU - Burda, C.
AU - Link, S.
AU - Green, T C
AU - El-Sayed, M.A.
PY - 1999
DA - 1999/12/01 00:00:00
PB - American Chemical Society (ACS)
SP - 10775-10780
IS - 49
VL - 103
SN - 1520-6106
SN - 1520-5207
ER -
BibTex |
Cite this
BibTex Copy
@article{1999_Burda,
author = {C. Burda and S. Link and T C Green and M.A. El-Sayed},
title = {New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses},
journal = {Journal of Physical Chemistry B},
year = {1999},
volume = {103},
publisher = {American Chemical Society (ACS)},
month = {dec},
url = {https://doi.org/10.1021/jp991503y},
number = {49},
pages = {10775--10780},
doi = {10.1021/jp991503y}
}
MLA
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MLA Copy
Burda, C., et al. “New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses.” Journal of Physical Chemistry B, vol. 103, no. 49, Dec. 1999, pp. 10775-10780. https://doi.org/10.1021/jp991503y.
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